I've been following your discussion with Brink. I believe that is correct. The 32 bit and 64 bit OS can exist on the same HD, on their own partition, and will have problems if attempting to access data on a common drive. For example your C drive is 32 bit, your D drive is 64 bit and your E drive is for data storage. In this case, you may run into conflicts if both the C and D drive access and use the E drive.
Brink can clarify his position on this when he returns. But from what I've read, I believe that is what he was communicating. Although I could be wrong. I am just trying to be helpful with this discussion.
I have noticed most people will have problems when a single data drive partition is shared by two different type of OS's like a 64 bit and 32 bit. I just prefer to keep the data disk split into a separate partition for each OS to avoid a potential problem all together. This is the main reason why Microsoft requires a clean install when you go from a 32 bit version of Vista to it's 64 bit version, or the other way around.
